Priming. Psychological testing would be impossible without it
   and yet the priming skews results.
   [1]http://www.nature.com/.../nobel-laureate-challenges...

   Lacking reliable data and resorting to pragmatism, it's still
   better to believe it's true. I see danger signs as the "we have
   no free will, because: SCIENCE" becomes more and more the norm
   in popular culture.

   In Italian court system, they're VERY keen on "brain scans",
   even though there's fundamental issues with fMRI that really
   _should_ make them about as reliable as an ink-blot as the
   "public impression" of their accuracy is much greater than their
   real accuracy.

   Same with DNA before it.
   Same with Blood tests before it.
   etc.

References

   Visible links
   1. http://www.nature.com/news/nobel-laureate-challenges-psychologists-to-clean-up-their-act-1.11535